Public bug reported:
Hi,
I currently can't upgrade a server machine (not the one this report is
coming from) from 18.04 to 20.04 since snapd breaks a required
functionality.
Under 18.04 I was running LXD on an encrypted file system, where virtual
machine root file systems are kept encrypted. After booting the machine I need
to login, enter password to uncrypt, and then start LXD once its /var directory
with the containers is available. After discussing this requirement with the
ubuntu LXD maintainers, I set all LXD systemd units on disabled and can easily
start them once the encrypted file system is online. This is possible, because
systemd allows to start a disabled service (without enabling it, thus at next
boot time again, it waits to be started manually).
Under 20.04 LXD is not available as a debian package/systemd unit anymore. I
just comes as a snap.
snapd also has enable/disable and start/top.
But then snapd differs from systemd in that you can't start a disabled
snap without enabling it.
Thus, once LXD is started as a snap, it will automatically start at next boot.
There is no manual start (without manual stop). If it runs, it will
automatically run after reboot.
In general, it's not possible to have a snap only started and run
manually, because it must be enabled to run and thus will run
automatically.
Degrade in functionality.
Regards
ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: snapd 2.46.1+20.04
ProcVersionSignature: Ubuntu 5.4.0-48.52-generic 5.4.60
Uname: Linux 5.4.0-48-generic x86_64
NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
ApportVersion: 2.20.11-0ubuntu27.9
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: LXQt
Date: Sun Oct 18 23:27:31 2020
InstallationDate: Installed on 2020-06-12 (128 days ago)
InstallationMedia: Lubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423)
SourcePackage: snapd
UpgradeStatus: No upgrade log present (probably fresh install)
modified.conffile..etc.sudoers.d.99-snapd.conf: [inaccessible: [Errno 13]
Permission denied: '/etc/sudoers.d/99-snapd.conf']
** Affects: snapd (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug focal
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https://bugs.launchpad.net/bugs/1900356
Title:
transition from systemd to snapd breaks functionality
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